When does Numberjacks return?

Numberjacks is a British 3D animated children's television series aimed at 4- to 5-year-olds. It is produced by Open Mind Productions for the BBC and features a mixture of computer-generated animation and live action. 67 episodes were produced.
Numberjacks are a group of anthropomorphic numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. They go about their everyday lives inside their sofa until a call comes in from real-life child Agents, who report problems that need solving.